What do we call the guys???

The legal term is solicitation of prostitution, and the person is often referred to as a sex buyer. Informally, they are known as a "john" or "trick". In other contexts, terms like whoremaster or whoremonger may also be used.
Legal terminology
Solicitation of prostitution: This is the act of requesting, offering, or agreeing to engage in sexual conduct for a fee.
Sex buyer: This term is increasingly used, particularly in jurisdictions that focus on the purchaser as the perpetrator of the crime.
Informal or slang terms
John: This is a very common slang term for a customer of a prostitute. It is believed to have originated because customers would give "John Smith" as a fake name to law enforcement to remain anonymous.
Trick: This is another informal term used, often by prostitutes and law enforcement, for a customer.
Punter: This is the equivalent of "john" in British and Irish slang.
Whoremaster / Whoremonger: These are older terms that can refer to a customer, but can also refer to a pimp or procurer.
Kerb crawler: This is a slang term, particularly in the UK, for someone who drives around looking for prostitutes.

Some of them view clients as marks.

Pokemen's
Intentionally spelled this way.
I know of a couple dozen club gals that group their clients into this label cause they trade the guys contact information like trading cards.

Lovers and call them love. I look at this hobby as my fun time so I'm just making special friends. I'm sure other ladies do use some of the terminology, but I feel those terms are harsh and I don't like using them.

Lovers and call them love. I look at this hobby as my fun time so I'm just making special friends. I'm sure other ladies do use some of the terminology, but I feel those terms are harsh and I don't like using them. Originally Posted by Seline

Well said lovely. Other then your being lovely its obvious you have the right mindset to be successful. How each party approaches their encounters can be either quite stimulating, or off putting. It doesn't take long reading these posts to get a fairly good idea in which category most here would fall.

Well said lovely. Other then your being lovely its obvious you have the right mindset to be successful. How each party approaches their encounters can be either quite stimulating, or off putting. It doesn't take long reading these posts to get a fairly good idea in which category most here would fall. Originally Posted by KCFalcon77

There's a huge difference between wanting/craving great encounters and needing an encounter.